Basic Water Works Operation Course Review

Comprehensive vocabulary review flashcards covering regulations, source water, coagulation, flocculation, sedimentation, filtration, disinfection, storage, distribution, pumps, meters, safety, and operational mathematics for water utility operators.

Chief Operator

An individual who has overall responsibility for the operation of a public water system.

Resiliency Training

Training required by the TCEQ for all Texas water operators as of April 1, 2024, enacted under Senate Bill 3 following Winter Storm Uri to address preparing for, preventing, and responding to weather emergencies and power outages.

Acre-foot

The volume of water that covers one acre to a depth of one foot, equivalent to $43{,}560\,\text{ft}^3$ or $325{,}829\,\text{gal}$.

Riparian Doctrine

A surface water allocation legal framework where landowners whose property adjoins a water body possess the right to make reasonable use of the water, provided it does not interfere with the rights of adjacent riparian owners.

Prior Appropriation Doctrine

A surface water allocation framework based on a first-come, first-served principle, where water rights are established by priority of beneficial use regardless of land ownership.

Absolute Ownership

A groundwater doctrine establishing that landowners have the legal right to extract unlimited quantities of groundwater from beneath their private property without restriction.

Correlative Rights

A groundwater allocation doctrine that distributes water among overlying landowners based on their proportionate share of land ownership to ensure equitable use and conservation.

Colloids

Very small, finely divided solids that carry negative electrical charges and remain dispersed in liquid indefinitely due to their small size and mutual electrostatic repulsion.

Trihalomethanes (THMs)

Carcinogenic chemical disinfection by-products formed when chlorine reacts with natural organic matter (THM precursors) in water, substituting three halogen atoms for hydrogen atoms on a methane molecule.

Trivalent Coagulants

Coagulant chemical compounds containing ions with a $+3$ charge (such as aluminum and iron) that are $50$ to $60$ times more effective than bivalent coagulants and up to $1{,}000$ times more effective than monovalent coagulants at neutralizing colloidal charges.

Streaming Current Meter (SCM)

An online monitoring instrument that continuously measures net electrical charge in treated water to provide real-time feedback on colloidal charge neutralization by coagulants.

Zeta Potential

The electrical potential measured in millivolts ($\text{mV}$) at the interface between a colloidal particle's surface and the surrounding liquid, where a value near zero indicates minimal repulsive force and promotes agglomeration.

Jar Test

A multi-station laboratory simulation of rapid-mixing, coagulation, flocculation, and sedimentation used by operators to evaluate and optimize coagulant dosages, pH, and floc formation.

Static Mixer

A pipe-mounted rapid-mix device containing fixed internal flow-deflection elements that uses the kinetic energy of flowing water to produce rapid turbulence without mechanical moving parts.

Flocculation

The slow, gentle mixing phase following coagulation designed to promote particle collisions and aggregate microflocs into larger, settleable macroflocs without applying excessive shear energy.

Clarifier

A large circular or rectangular sedimentation tank or basin in which water is detained under quiescent conditions to permit heavier suspended solids to settle by gravity.

Launders

Sedimentation basin discharge channels fitted with overflow weir plates and collection troughs that uniformly convey clarified water away from the settling zone.

Solids Contact Basin

An upflow clarification basin that combines chemical flash mixing, flocculation, sludge-blanket filtration, and solids recirculation within a single circular unit.

Dissolved Air Flotation (DAF)

A clarification process that introduces pressurized, air-supersaturated recycle water into a basin to release microbubbles that attach to low-density particles, algae, and organic floc, floating them to the surface for skimming.

Schmutzdecke

A biologically active layer of trapped organic matter, algae, and microorganisms that develops on the surface of a slow sand filter and purifies water via straining and biological predation.

Effective Size

The particle size diameter corresponding to the $10^{\text{th}}$ percentile ($D_{10}$) by weight on a granular filter media grain size distribution curve.

Uniformity Coefficient (UC)

A dimensionless measure of filter media grain size variation calculated by dividing the sieve size opening that allows $60\%$ of the media sample by weight to pass ($D_{60}$) by the size that allows $10\%$ to pass ($D_{10}$).

Breakpoint Chlorination

The addition of chlorine to water until the chlorine demand has been fully satisfied, after which any additional chlorine creates an equivalent free chlorine residual.

Chlorine Demand

The quantitative difference between the total dose of chlorine added to water and the residual chlorine remaining after a defined contact time ($\text{Demand} = \text{Dose} - \text{Residual}$).

Free Available Residual Chlorine

The portion of total residual chlorine consisting of uncombined dissolved chlorine gas ($\text{Cl}_2$), hypochlorous acid ($\text{HOCl}$), and hypochlorite ions ($\text{OCl}^-$) remaining in water after disinfection.

Chloramines

Combined chlorine compounds produced through the reaction of hypochlorous acid or aqueous chlorine with ammonia, commonly utilized to maintain a persistent residual in distribution networks and lower DBP formation.

Altitude Valve

An automatic pressure-actuated valve that closes to halt flow into an elevated water storage tank when the water surface reaches a predetermined high-water elevation.

Sacrificial Anode

A highly active metal element intentionally mounted inside a steel storage tank or piping network to prevent corrosion of the primary structure by corroding preferentially over an approximate $10\text{-year}$ service life.

Water Hammer

A destructive hydraulic pressure wave and acoustic surge inside a pipeline caused by sudden changes in fluid velocity, most commonly provoked by rapidly closing valves or abrupt pump shutdowns.

C Value (C Factor)

An empirical coefficient indicating the interior hydraulic roughness of a pipe; higher values represent smoother internal walls that produce less friction loss during flow.

Push-on Joint

A pipe connection consisting of a bell socket housing an elastomeric rubber ring gasket that seals upon the insertion of a lubricated, beveled pipe spigot.

Angle of Repose

The maximum incline or slope angle relative to the horizontal at which unsupported soil along an excavation sidewall will remain stable without sliding or collapsing into the trench.

Shoring

A structural trench-protection assembly consisting of upright vertical members, horizontal stringers, and cross braces that applies mechanical pressure against excavation walls to prevent soil collapse.

Haunching

The placement and careful compaction of bedding material under and around the bottom curvature of a pipe to ensure continuous radial support and increase pipe load-bearing capability.

Dry-Barrel Hydrant

A fire hydrant constructed for cold climates where the main operating valve and drain mechanism are positioned underground beneath the frost line, leaving the barrel empty of water when closed to avoid freezing.

Cross-Connection

Any physical arrangement or structural connection between a potable public water system and a non-potable piping network or fluid source through which contamination could enter via backflow.

Reduced Pressure Zone (RPZ) Backflow Preventer

A high-hazard mechanical backflow prevention assembly featuring two independently acting spring-loaded check valves separated by a central hydraulically operating differential pressure relief valve.

Centrifugal Pump

A velocity pump that uses a motor-driven impeller to accelerate fluid radially outward into an expanding volute casing, converting kinetic velocity into discharge pressure.

Best Efficiency Point (BEP)

The operating point on a pump performance curve where the pump delivers fluid at its maximum hydraulic efficiency for a designated impeller diameter and rotational speed.

Positive Displacement Pump

A mechanical pump mechanism (such as a reciprocating piston or diaphragm pump) that delivers a consistent, discrete volume of liquid per operating stroke or cycle irrespective of discharge line pressure.

Compound Meter

A dual-unit water meter incorporating an internal turbine meter for measuring peak high flows and a small positive displacement meter for recording low flows, governed by an automatic crossover valve.

Venturi Meter

A differential-pressure flow meter featuring a smooth, tapered constriction within a pipeline that produces a measurable pressure drop directly proportional to the fluid flow rate.

Permit-Required Confined Space

An enclosed space with restricted entry and exit that contains or has the potential to contain atmospheric hazards, engulfment hazards, converging trapping walls, or other serious health and safety dangers.

Immediately Dangerous to Life or Health (IDLH)

An environmental exposure concentration of an airborne hazardous chemical capable of causing fatal consequences, permanent disability, or hindering unassisted escape; set at $10\,\text{ppm}$ for chlorine gas by NIOSH.

Public Water System (PWS)

A system providing piped water for human consumption that maintains at least $15$ service connections or regularly serves an average of at least $25$ people daily for at least $60\,\text{days}$ per calendar year.

Maximum Contaminant Level (MCL)

The highest concentration of a specific contaminant legally permitted in drinking water delivered by a public water system, enforceable under the Safe Drinking Water Act.

Level 1 Assessment

A basic self-inspection conducted by a public water system under the Revised Total Coliform Rule within $30\,\text{days}$ of a trigger event to identify sanitary defects in the water system.

Chemical Feed Rate Formula (Pounds per Day)

The standard water utility formula used to determine chemical feed: $\text{lb/day} = (\text{Flow in MGD}) \times (\text{Dose in mg/L}) \times 8.34\,\text{lb/gal}$.

Detention Time

The calculated duration that water is held within a sedimentation basin or storage tank, determined mathematically by the formula: $\text{Time} = \frac{\text{Volume}}{\text{Flow Rate}}$.